Salbutamol

SABA·Respiratory - Asthma & COPD

Acute relief of bronchospasm in asthma and COPD, exercise-induced asthma

PBSSABAVentolin, AsmolS4TGA

Max Dose

Variable

Onset

2–3 mins

Hypokalemia

RISK

Tachycardia

COMMON

Rapid Summary

Overview

Short-Acting Beta-2 Agonist (SABA). The universal rescue bronchodilator for acute asthma and COPD exacerbations. Rapidly relieves bronchospasm.

Maximum Dose

Max varies entirely by acuity. In severe acute asthma, can be given continuously via nebuliser.

Clinical Focus

High doses drive potassium into cells, making it a highly effective emergency adjunct for treating severe hyperkalemia.

Bottom Line

Salbutamol is the first-line reliever for acute bronchospasm in asthma and COPD, but overuse (>2 days/week) signals poor control requiring preventer therapy escalation.

Formulation & Access

Brand Names

Ventolin, Asmol

Oral Routes

Metered Dose Inhaler (100 mcg/actuation). Nebules (2.5 mg/2.5 mL, 5 mg/2.5 mL).

Parenteral

Ampoules for IV infusion (ICU/Specialist only).

Prescribing & PBS

Unrestricted General Benefit (MDI is S3 OTC, Nebules are S4).

Indications & Use

Primary

PBSTGA

Acute relief of bronchospasm in asthma and COPD, exercise-induced asthma.

Off-Label

OFF

Acute hyperkalemia (temporising measure).

Clinical Place

The definitive first-line rescue inhaler. Not to be used as daily maintenance monotherapy in asthma.

Quick reference

Class & Role

SABA — Short-Acting Beta-2 Agonist (SABA).

Route / Formulation

Metered Dose Inhaler (100 mcg/actuation). Nebules (2.5 mg/2.5 mL, 5 mg/2.5 mL). (Ventolin, Asmol)

Usual Dose & Max

Inhaled 4–12 puffs (100 mcg/puff) via spacer every 20 mins for first hour, then PRN. Max varies entirely by acuity. In severe acute asthma, can be given continuously via nebuliser.

Key Indication Doses

Acute Asthma / COPD (MDI): Inhaled 4–12 puffs (100 mcg/puff) via spacer every 20 mins for first hour, then PRN. Severe Exacerbation (Neb): Inhaled 2.5–5 mg via nebuliser every 20 mins, or continuously in life-threatening cases. Hyperkalemia (Off-Label): Inhaled 10–20 mg via nebuliser STAT to rapidly shift K+ intracellularly.

Best Uses

Salbutamol is the first-line reliever for acute bronchospasm in asthma and COPD, but overuse (>2 days/week) signals poor control requiring preventer therapy escalation.

Avoid / Cautions

Avoid IV use in risk of maternal hemorrhage (tocolytic effect). Pregnancy Category A. Safe for acute relief.

Key Risks

Cardiovascular: Tachycardia, palpitations. MODERATE — Vasodilatory flushing. Neurological: Fine tremor (especially hands), anxiety, restlessness. Metabolic: Hypokalemia (transient), mild hyperglycemia, lactic acidosis with massive continuous doses.

Key Interactions

Non-selective Beta-blockers (e.g., Propranolol) directly antagonise Salbutamol and can trigger fatal bronchospasm. Additive hypokalemia if given with non-potassium sparing diuretics (e.g., Frusemide).

Monitoring

Monitor SpO2, RR, and HR. Assess work of breathing. Symmetrical tachycardia is an expected physiological response. Check U&E (potassium) if administering massive repeated nebulised doses.

Clinical Pearl

MDI with a spacer is equally or MORE effective than a nebuliser for mild-to-moderate asthma, as nebulisers aerosolise the drug into the mouth/throat where it is swallowed and causes systemic tremor/tachycardia without helping the lungs.

Access

Ventolin, Asmol

Brand: Ventolin, Asmol
Formulation: Metered Dose Inhaler (100 mcg/actuation)

Salbutamol

SABA·Respiratory - Asthma & COPD

Acute relief of bronchospasm in asthma and COPD, exercise-induced asthma

PBSSABAVentolin, AsmolS4TGA

Max Dose

Variable

Onset

2–3 mins

Hypokalemia

RISK

Tachycardia

COMMON

Rapid Summary

Overview

Short-Acting Beta-2 Agonist (SABA). The universal rescue bronchodilator for acute asthma and COPD exacerbations. Rapidly relieves bronchospasm.

Maximum Dose

Max varies entirely by acuity. In severe acute asthma, can be given continuously via nebuliser.

Clinical Focus

High doses drive potassium into cells, making it a highly effective emergency adjunct for treating severe hyperkalemia.

Bottom Line

Salbutamol is the first-line reliever for acute bronchospasm in asthma and COPD, but overuse (>2 days/week) signals poor control requiring preventer therapy escalation.

Formulation & Access

Brand Names

Ventolin, Asmol

Oral Routes

Metered Dose Inhaler (100 mcg/actuation). Nebules (2.5 mg/2.5 mL, 5 mg/2.5 mL).

Parenteral

Ampoules for IV infusion (ICU/Specialist only).

Prescribing & PBS

Unrestricted General Benefit (MDI is S3 OTC, Nebules are S4).

Indications & Use

Primary

PBSTGA

Acute relief of bronchospasm in asthma and COPD, exercise-induced asthma.

Off-Label

OFF

Acute hyperkalemia (temporising measure).

Clinical Place

The definitive first-line rescue inhaler. Not to be used as daily maintenance monotherapy in asthma.

Quick reference

Class & Role

SABA — Short-Acting Beta-2 Agonist (SABA).

Route / Formulation

Metered Dose Inhaler (100 mcg/actuation). Nebules (2.5 mg/2.5 mL, 5 mg/2.5 mL). (Ventolin, Asmol)

Usual Dose & Max

Inhaled 4–12 puffs (100 mcg/puff) via spacer every 20 mins for first hour, then PRN. Max varies entirely by acuity. In severe acute asthma, can be given continuously via nebuliser.

Key Indication Doses

Best Uses

Salbutamol is the first-line reliever for acute bronchospasm in asthma and COPD, but overuse (>2 days/week) signals poor control requiring preventer therapy escalation.

Avoid / Cautions

Avoid IV use in risk of maternal hemorrhage (tocolytic effect). Pregnancy Category A. Safe for acute relief.

Key Risks

Key Interactions

Monitoring

Monitor SpO2, RR, and HR. Assess work of breathing. Symmetrical tachycardia is an expected physiological response. Check U&E (potassium) if administering massive repeated nebulised doses.

Clinical Pearl

Access

Ventolin, Asmol

Brand: Ventolin, Asmol
Formulation: Metered Dose Inhaler (100 mcg/actuation)